Good evening Paul and welcome back!
Thank you for reaching out to us.
We are sorry to hear about calendar not displaying at all on your site.
I would love to help you with this topic.
The first thing I would recommend is trying different settings for Events Template under Events -> Settings -> Display.
Please make sure that you are emptying your cache plugin’s cache.
If that does not work, could you please send me a copy of the latest version of your WordPress theme / child theme via a link to a .zip file link (stored Dropbox or Google Drive) so that I can run some tests on my end ? I recommend a private reply for that purpose.
Please ensure you are using the latest files as found on your actual website.
This way I will get access to any updates or customizations you might have made.
Best regards,
Geoff B.